From Mayo Clinic to your inbox Sign up for free and stay up to date on research advancements, health tips, current health topics, and expertise on managing health. The penis is one of the areas where this enzyme works. This medicine is available on prescription and you can also buy it from most pharmacies. Also tell your doctor if you have or have ever had pulmonary veno-occlusive disease PVOD; blockage of veins in the lungs ; a stomach ulcer; heart, kidney, or liver disease; a heart attack; heart failure; angina chest pain ; an irregular heartbeat; a stroke; chest pain; high or low blood pressure; high cholesterol; a bleeding disorder; blood circulation problems; blood cell problems such as sickle cell anemia a disease of the red blood cells , multiple myeloma cancer of the plasma cells , or leukemia cancer of the white blood cells ; conditions affecting the shape of the penis e. Without physical action to the penis, such as that occurring during sexual intercourse, sildenafil will not work to cause an erection.Find patient medical information for Viagra oral on MD including its uses, side effects and safety, interactions, pictures, warnings and user ratings. The Savings Offer and Program expire on 12/31/ For further information, call , visit test1.ru, or write: Viatris Inc., P.O. Box , Mission, KS Eligible patients may save on their VIAGRA® (sildenafil citrate) prescription with the VIAGRA savings card. Cost: Branded Viagra is available starting at $ per dose. Generic Viagra is also available through Hims starting at $4 per dose. Product details Usage: take as needed.